JPH08182948A - Device for collecting and decomposing coating material - Google Patents

Abstract

PURPOSE: To mix a coating material diffused into the air with water in a turbid state, to catch it with high efficiency and to make an organic solvent odorless and harmless before diffusing it into the air. CONSTITUTION: A device is provided with a filter chamber 3 arranged between a coating chamber 5 and an exhaust fan 41 and having a partition plate 7 whose lower end is located under the surface of water of a water tank 6, a reverse plate 10 arranged near the partition plate 7, the 1st filter 12 installed in a range that water droplets generated by the partition plate 7 and the reverse plate 10 can reach, and an ozone air bubbling means 11 arranged near the partition plate 7. The filter chamber 3 is kept at negative pressure and a coating material diffused into the air is submerged in water W in a water tank 6 through the lower end of the partition plate 7. Solid components constituting the coating material are mixed with the water W to be in a turbid state and caught by the 1st filter 12 to collect the coating material, and also an organic solvent constituting the coating material is decomposed by ozone air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for recovering a pigment in a paint released to the atmosphere by spray coating or the like, and oxidizing and decomposing an organic solvent to deodorize it.

[0002]

2. Description of the Related Art Since a paint is composed of a pigment and a film-forming agent dissolved in an organic solvent, a large amount of the organic solvent and the pigment are released into the atmosphere to pollute the environment especially in spray coating. Using a paint booth that is shielded from the surrounding environment and has a negative pressure inside by an exhaust fan, the solvent and paint are trapped in the booth to capture the pigment and film-forming agent, and the solvent is removed. Measures have been taken to prevent the components constituting the paint from being released into the atmosphere by adsorbing it onto activated carbon or the like.

However, since a large amount of pigment or solvent released in the exhaust gas adheres to the filter, there is a problem that the processing capacity of the filter is reduced in a short time and frequent replacement of the filter material increases the running cost.

In order to solve such a problem, a water tank is provided in the lower part, and a partition plate whose lower part is located below the water surface of the water tank is provided between the painting area and the fan so that the paint diffused in the painting room is temporarily removed. , It is also carried out by diving in water. According to this, most of the paint can be taken into the water in the aquarium, but not only does the paint adhere to and solidify on the walls that make up the coating booth, drain boards, etc. There is a problem that a large amount of solvent is released.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to efficiently make a paint dispersed in the atmosphere cloudy with water and capture it. It is an object of the present invention to provide a novel paint collecting and decomposing device capable of oxidizing and decomposing an organic solvent into an odorless and harmless substance.

[0006]

In order to solve such a problem, in the present invention, a filter chamber having a partition plate disposed between the coating chamber and the exhaust fan and having a lower end located below the water surface of the water tank. A return plate arranged in the vicinity of the partition plate, a first filter provided in a range where water droplets generated by the partition plate and the return plate reach, and bubbling of ozone air arranged in the vicinity of the partition plate. Means for maintaining a negative pressure in the filter chamber to disperse the paint diffused in the atmosphere through the lower end of the partition plate into the water in the water tank, and to the solid component water constituting the paint. Was collected by the turbidity of the above and captured by the filter, and the organic solvent constituting the paint was decomposed by the ozone air.

[0007]

[Function] The paint that has dipped at the lower end of the partition plate is decomposed by ozone and easily turbid in water to be captured with high efficiency, and the paint adhered to the filter or the lower part of the filter chamber is also a bubble or bubble of ozone water from the water tank. , Decomposed by water droplets and easily peeled off. Further, the organic solvent that has passed through the filter is oxidized and decomposed by ozone to become an odorless and harmless substance, and is emitted to the atmosphere.

[0008]

EXAMPLES The details of the present invention will be described below based on examples incorporated in a coating booth. FIG. 1 shows an embodiment of the present invention. In the drawing, reference numeral 1 is a coating booth, and a coating chamber 5 is defined by a wall plate 4 which constitutes a filter chamber 3 of a paint recovery / decomposition device 2 described later. Is configured to.

A water tank 6 is provided in the lower part of the filter chamber 3, and an exhaust fan 41 driven by a motor 40 is connected to the upper part thereof. When the filter chamber 3 is under normal pressure, the coating chamber 5 and the filter chamber A partition plate 7 whose lower part is immersed in water and whose height can be adjusted is attached to the lower end of the wall plate 4 of the filter chamber 5 so that the chamber 3 and the chamber 3 are blocked by the water W in the water tank 2.

FIG. 2 shows an embodiment of the partition plate 7 described above. When the wall plate 4 is set as the partition plate, the area immersed in the water W has a triangular shape with the upper part as the apex. Hole 7
a, 7a, 7a ... Are provided.

Returning to FIG. 1 again, reference numeral 10 in the figure is a return plate, which is installed near the partition plate 7 and efficiently generates air bubbles and water bubbles when air passes under the partition plate 7. At the same time, a bottom plate 10a, which is used to scatter bubbles, water bubbles, and even water droplets upward, is arranged at a constant interval from the lower end of the partition plate 7, and a return portion 10b that overhangs on the partition plate 7 side. It consists of

Reference numeral 11 is a bubbling means arranged so as to be submerged in the vicinity of the partition plate 7, which is a porous material obtained by sintering a pipe having a large number of pores or a metal powder having a large particle size. A pipe or the like formed as described above, one end of which is sealed, and the other end of which is connected to an ozone air generation device 30 described later via a pipe 21.

Reference numeral 12 is a filter for adsorbing the pigment constituting the paint, the film forming agent, etc., and is a partition plate within the flight range of water bubbles, bubbles and water droplets generated by the partition plate 7 and the return plate 10. It is arranged so as to be inclined with the 7 side as the apex.

Reference numerals 13 and 14 are second and third, respectively, containing an oxidation catalyst for oxidizing and decomposing the organic solvent constituting the paint.
Below the filters, there are baffles 15, 16, 1 for forcibly meandering the air flow in the filter chamber 3.
7 and 18 are provided, ozone air outlets 19 and 20 are provided in the vicinity thereof, and are connected to an ozone air generating device 30 by a pipe 21.

The volumes of the spaces occupied by these filters 13 and 14 are set to be substantially equal to each other, and
The load factors of No. 4 are configured to be even.

Reference numeral 22 is a water receiving plate disposed below the first filter 12, and is configured to return water from the through hole 22a to the water tank 6.

Reference numeral 30 denotes the ozone air generator described above, which is constituted by connecting a compressor 31, a pressure accumulating tank 32, and ozone generating means 33 such as an ultraviolet discharge lamp or a corona discharge device, and is connected by a pipe 21 via a valve 34. Are connected to the bubbling means 11 and the outlets 19 and 20.

In the figure, reference numeral 23 is a water supply / drainage port of the water tank 6, 35 is a valve provided at the air inlet of the ozone generating means 33, and 42 is an exhaust port of the exhaust fan 41.

In this embodiment, when the exhaust fan 41 is operated, the filter chamber 3 has a strong negative pressure, so that the atmosphere in the coating chamber 5 flows from the through holes 7a, 7a, 7a. The water W of 6 is dipped into the filter chamber 3. As a result, the water in the water tank 6 becomes a violent flow from the coating chamber 5 to the filter chamber 3 side on the surface thereof and is repelled by the return plate 10 to form bubbles, water bubbles, and water drops, which are separated as shown in FIG. Ascends along the plate 7 and reaches the first filter 12.

On the other hand, the ozone air sent from the ozone generator 30 is discharged from the bubbling means 11 to the water W in the water tank 6, and a part of ozone is dissolved in the water W to generate ozone water, and bubbles or water bubbles are generated. , Contained in the water droplets and supplied to the first filter 12.

In this state, when spray coating is performed in the coating chamber 5 and the paint is dissipated into the atmosphere, the paint is discharged from the through holes 7a, 7a, 7a. Is drawn into the filter chamber 3 so as to pass through, and bubbles and water bubbles are generated together with the ozone air from the bubbling means 11. In this process, the filter chamber 3 is raised while efficiently contacting ozone water and ozone air, The solid component is captured by the first filter 12.

In this process, the pigment contained in the paint,
The film-forming agent composed of an organic substance is decomposed by the strong oxidizing action of ozone water, and dissolves in water W with a higher solubility than when it itself comes into contact with water, or becomes cloudy,
It is also captured by the water W.

By the way, the solid components such as the pigment and the film forming agent captured by the filter 12 adhere to the filter 12 and solidify, but ozone water is constantly supplied to the filter 12 as water bubbles, bubbles and water drops. Therefore, it easily peels off due to the oxidizing action of ozone and the physical action due to the collision of bubbles,
The filter 12 will undergo self-cleaning. Similarly, the pigment and the film forming agent attached to the partition plate 7 are also oxidized by the action of ozone water, and are easily peeled off by receiving the physical energy of bubbles and water bubbles generated here.

The bubbles and water bubbles that have reached the first filter 12 become water droplets and fall on the water receiving plate 21 and are returned to the water tank 6 through the through holes 21a.

On the other hand, the water W or the organic solvent that has passed through the first filter 12 rises in the filter chamber 3 together with the ozone from the ozone outlets 19 and 20, and is forced by the baffles 12 and 13 and the baffles 14 and 15. Are meandered and efficiently stirred with ozone air to be oxidized and decomposed by ozone, and also oxidized by the catalysts of the filters 13 and 14 to become harmless and odorless components, which are released from the exhaust port 42 to the atmosphere. It In this way, since oxidation and decomposition are performed with the help of ozone which is constantly supplied, the amount of organic solvent to be processed by the filters 13 and 14 is reduced, and as a result, the life of the filter can be extended. Further, the concentration and amount of ozone in the ozone air supplied from the ozone generation device 30 are adjusted to be below the environmental standard when released into the atmosphere from the exhaust port 42.

FIG. 4 shows a second embodiment of the present invention. In the figure, reference numeral 40 is a filter chamber constituted by a tubular body 45, and a lower end 45a of the tubular body 45 has a water tank 41 which will be described later. An opening 42 that is submerged in the water W and connects to an exhaust fan is formed in the upper portion.

Reference numeral 41 denotes the above-mentioned water tank, which communicates with the atmosphere through an opening 43 connected to the coating chamber, and a cylindrical body 45.
Box-shaped so that a space can be secured between it and.

A lower end 45a of the cylindrical body 45 is formed with a through hole whose upper portion is narrowed like the partition plate 7 described above.
A return plate 46 and a bubbling means 47 are arranged in the vicinity of this.

A first filter 48 for adsorbing the pigment and the film forming agent forming the paint is provided in the upper space in the range where the bubbles and water bubbles generated at the lower end 45a of the cylindrical body 45 and the return plate 46 reach. Is a baffle plate 50, 51, a second filter 52,
The baffles 53, 54 and the third filter 55 are arranged in layers, and ozone air outlets 56, 57 are provided in the vicinity thereof.
Is provided. Reference numeral 58 in the figure indicates a water receiving plate.

In this embodiment, the opening 43 of the water tank 41
To the coating chamber, and when the exhaust fan is operated by connecting the opening 42 of the barrel body 45 to the exhaust fan, the air containing the paint in the coating chamber dips the water W in the water tank 41 from the lower end 45a of the barrel body 45. Bubbles and water bubbles of ozone water are generated between the return plate 46.

As a result, the film forming agent or pigment in the paint is oxidized and decomposed by the ozone water, and a part thereof becomes turbid in the water W,
Further, a part is adsorbed to the first filter 48. The organic solvent that has passed through the first filter 48 is agitated by the ozone air from the outlets 56 and 57 and the baffles 50, 51, and 52, 53 to be oxidized and decomposed, and the second and third filters 5
Even 2,55 catalysts are oxidized and decomposed before being released to the atmosphere.

According to this embodiment, the pigment, the film-forming agent and the organic solvent in the paint can be easily replaced by simply connecting the existing paint booth which does not have the paint collecting means and the exhaust fan. Can be recovered and disassembled.

In the above-mentioned embodiment, the ozone discharge port is arranged near the baffle plate so that the ozone can be used efficiently. However, when a sufficient amount of ozone can be discharged from the bubbling means. It is obvious that the organic solvent can be oxidized and decomposed only by the ozone from the bubbling means without requiring the ozone emission port.

Further, in the above embodiment, the second and third
Although the filter contains a catalyst that oxidizes and decomposes the organic solvent, it may contain a catalyst that decomposes ozone.

[0035]

As described above, in the present invention, a filter chamber having a partition plate disposed between the coating chamber and the exhaust fan and having a lower end located below the water surface of the water tank, and the vicinity of the partition plate. Since the filter chamber is provided with a return plate disposed in the partition plate, a first filter provided in a range where water droplets generated by the partition plate and the return plate reach, and a bubbling means for ozone air arranged in the vicinity of the partition plate. The negative pressure is maintained and the paint diffused into the atmosphere is passed through the lower end of the partition plate to immerse the water in the water tank, and the solid components that make up the paint are turbid in water and collected by the filter. Also, the organic solvent that composes the paint is decomposed by ozone air, and the pigment and film-forming agent in the paint adhering to the filter are peeled off with ozone water, and the paint is released to the atmosphere as odorless and harmless. I just can , It is possible to extend the life of the filter.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a lower end of a partition plate.

FIG. 3 is a diagram showing the behavior of ozone water in the vicinity of the water surface of a water tank.

FIG. 4 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 coating booth 3 filter room 6 water tank 7 partition plate 5 coating room 10 return plate 11 bubbling means 12 first filter 13, 14 second, third filter 15-18 baffle plate 19, 20 ozone air outlet 30 ozone generator W water

Claims (7)

[Claims] 1. Arranged between the coating chamber and the exhaust fan,
A filter chamber having a partition plate whose lower end is located below the water surface of the water tank, a return plate arranged in the vicinity of the partition plate, and a first provided in a range where water droplets generated by the partition plate and the return plate reach. A filter and a bubbling means for ozone air arranged near the partition plate are provided, and the paint diffused in the atmosphere while maintaining the filter chamber at a negative pressure is passed through the lower end of the partition plate so that the water in the water tank is discharged. And a solid component that composes the paint is turbid in water, and is collected by the filter, and the organic solvent that composes the paint is oxidized and decomposed by the ozone air. . 2. The paint collecting and disassembling apparatus according to claim 1, wherein the depth of the lower end of the partition plate in water is adjustable. 3. The paint recovery system according to claim 1, wherein a plurality of baffle plates are provided in a space between the exhaust fan and the water tank, and an air outlet for air containing ozone is arranged in the vicinity of the baffle plates.
Disassembly device. 4. The paint recovery and decomposition apparatus according to claim 1, wherein a filter including an oxidation catalyst that oxidizes an organic solvent is arranged near the baffle plate. 5. The paint collecting and decomposing apparatus according to claim 1, wherein a catalyst for decomposing free ozone is mixed in the filter. 6. The paint collecting and disassembling apparatus according to claim 4, wherein the filters are provided in a plurality of stages. 7. The paint collecting and disassembling apparatus according to claim 1, wherein a part of a wall surface constituting the filter chamber constitutes a coating booth.